Add script for selecting assignment users

moodle/README.md

@@ -4,6 +4,8 @@
 Scripts for getting bulk information out of Moodle that you might find
 useful.
 
+* `assignment-select-users.py` -- select a list of users on the
+  assignments page (useful for e.g. granting bulk extensions)
 * `create-groups.rb` -- ruby script that takes a CSV file of
   students/groups and creates the groups on Moodle.
 * `quiz-get-urls.py` -- make a CSV of all quizzes on a module, for use